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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A230205 Expansion of phi(-x) * f(x^1, x^7) in powers of x where phi(), f() are Ramanujan theta functions.

Table of values

n a(n)
0 1
1 -1
2 -2
3 0
4 2
5 2
6 0
7 1
8 -2
9 -2
10 -1
11 0
12 0
13 0
14 2
15 0
16 0
17 2
18 0
19 -2
20 0
21 0
22 1
23 0
24 0
25 -2
26 2
27 1
28 -2
29 0
30 0
31 0
32 -2
33 0
34 0
35 -2
36 0
37 2
38 2
39 0
40 0
41 0
42 0
43 4
44 0
45 1
46 0
47 -2
48 0
49 0
50 -2
51 0
52 -1
53 -2
54 -2
55 0
56 0
57 0
58 2
59 -2
60 0
61 0
62 0
63 2
64 2
65 2
66 0
67 0
68 2
69 0
70 -2
71 0
72 0
73 0
74 2
75 0
76 -1
77 -4
78 0
79 0

List of values

[1, -1, -2, 0, 2, 2, 0, 1, -2, -2, -1, 0, 0, 0, 2, 0, 0, 2, 0, -2, 0, 0, 1, 0, 0, -2, 2, 1, -2, 0, 0, 0, -2, 0, 0, -2, 0, 2, 2, 0, 0, 0, 0, 4, 0, 1, 0, -2, 0, 0, -2, 0, -1, -2, -2, 0, 0, 0, 2, -2, 0, 0, 0, 2, 2, 2, 0, 0, 2, 0, -2, 0, 0, 0, 2, 0, -1, -4, 0, 0]

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